Ibc Minimum Flat Roof Slope

The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.

Ibc minimum flat roof slope.

2 12 minimum roof slope for asphalt shingles photovoltaic pv shingles and building integrated pv. Minimum roof fire resistance ratings apply based on the type of construction and some building types do not require a fire rating. I am looking at the ibc minimum roof slope requirement for standing seam metal roof. Per foot would be acceptable.

I understand this is more of rounding off to get to a nice number. The ibc table 1505 1 lists the minimum requirements for roof covering fire resistance classifications a b or c for all types of. This logic does not consider that lower sloped roofs will not drain water at the same rate as roofs with greater slopes. The minimum slope the code allows is in 12 in.

And 4 12 minimum roof slope for slate and wood shakes. For steep slope roof systems ibc 2018 provides for a 1 12 minimum roof slope for mineral surfaced roof roll roofing. So typically we follow 2 slope is that meeting the code even if the slope is slight shy of 1 4 per foot. When required testing is in accordance with astm e108 or ul 790.

2 1 2 12 minimum roof slope for clay and concrete tile. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Ibc callouts for min 2 or 1 4 per foot. For roof slopes from two units vertical in 12 units horizontal 17 percent slope up to four units vertical in 12 units horizontal 33 percent slope double underlayment application is required in accordance with section 1507 2 8.